crenation

Noun
  1. One of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.) (synset 113897197)
    is a type of: curve, curved shape - the trace of a point whose direction of motion changes
    same as: crenature, crenel, crenelle, scallop

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